| 序号 | 时间 (年) |
数据 (-) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | |
| 8 | 2014 | |
| 9 | 2013 | |
| 10 | 2012 | |
| 11 | 2011 | 30.82 |
| 12 | 2010 | 32.71 |
| 13 | 2009 | 31.74 |
| 14 | 2008 | 31.37 |
| 15 | 2007 | 29.10 |
| 16 | 2006 | 25.92 |
| 17 | 2005 | 26.63 |
| 18 | 2004 | 14.70 |
| 19 | 2003 | 14.77 |
| 20 | 2002 | 36.94 |
| 21 | 2001 | 12.16 |
| 22 | 2000 | 12.20 |
| 23 | 1995 | 6.91 |
| 24 | 1990 | 5.92 |
| 25 | 1985 | 10.16 |
| 26 | 1980 | 8.07 |
| 27 | 1975 | 12.82 |
| 28 | 1970 | 9.15 |
| 29 | 1965 | 11.71 |
